Grinding machine



E. F. FROST. GRINDING MACHINE. APPLICATION FILED JAN. 8, I921.

Patented Nov. 21, 1922,

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5114mm Z [me/F, E1263.

E. F. FROST.

GRINDING MACHINE. APPLICATION FILED JAN. 8. 192]- v I 1,43 ,309, Patented Nov. 21, 1922.

2 SHEETS-SHFET 2.

m. gmmoz Patented Nov. 21, 1922.

nane Parent carie ELI/EEK Fl FRQST, OF CRYSTALIJIICHIGAN.

: en'mnine MACHINE.

application filed January 8, 1921. Serial No. 435,970.

To all whom it may cm'ic'em:

"Be it"known that 'RELMER F. FROST, a citizen of the" United States, residing at Crystal, in" the county of Montcalm and Stateof Michigan, have invented certain new and useful Improvements in Grinding Machines, of which the following is a specification.

"This invention rqriela-tes to": machines for automatically finishingfaiztieles; as by grind ing or a alogous "operation The" invention, While capable of general; a plication, finds advantageous use in grinding machines for finiehingthe; faces* of cylindrical articles or Eggs, such as piston raga-ban races and the Thefprimary'obj'ect of the'invention' is to provide in combination, atool for finishing articles, a continuously movable ar'ticl'e carrie'r, or holder for feeding thearticles t-othe tO'oL-and fo'i-"rernovin f thefn' therefrom, and means for automatically delivering Y the articles to the continuously moving carrier An'otherobject" of the invention is to prorality of faces, without necessitating the removal' of the articles from the machine prior to their completion Another object'of the invention is to provide in a machinefor autom'atically finishing vide a continuously movable article carrier or helder: in eoznbinationawith means automatically delivering? articles thereto and also Other objects and advantages of the invention will become apparent during the coarse of. the following description.

vide in combination "with the foregoing, means for finishing the articles on a 13111 A further object of the invention is tp'pro- '1n' the accompanying drawings forming a part of the application wherein like numerals are employedto designate like parts, throughout the several views,

} Figure 1 is a plan of the machine.

Flgure 2 is a fragmentary, side elevation, parts being broken away.-

Figure 3 is a fragmentary,verticalsection of a' part of the invention, and

Figure 4 is a sectional View of the delivering mechanism.

Referring to the drawings wherein for the purpose of illustration isshown the preferred embodiment of the invention, thenumeral 5 designates the top orsurface plate of the machine frame, upon which revolves an article or Work carrier or holder inthe present instance being a disk 6. The invention being particularly adapted for grinding faces of piston rings, this disk is provided with a plurality of concentrically arranged circles of openings 7 adjacent the circumference of the disk. These openings are of a size to'receive piston rings and to retain them in properposition relative to the disk. A vertical shaft 8 is'provided at its upper end with a reduced threaded portion 9 which isextended'through and secured to the hub portion'lO of therevolving carrier 6. a nut 11 being threaded upon this reduced end to secure the-same in the'hub. A worm wheel 18 is keyed to the shaft a distance below the revolving carrier for meshing engagement with a worm 15 carried by an operatinghorizontally disposed shaft 14 which receives its powerfrom any suitable source.

Worms 15 are'also carried by the shaft 14; in spaced relation from the worm 13 for meshing engagement with worm wheels 16 keyed or otlierwisesecured to:chuch shafts 17. These'chuck shafts are mounted vertically within. the machine and are arranged at approximately theend of a quadrant ofthe carrier disk '6 and bey' ondwthe periphery thereof. Thetwo worms 15 of the operating shaft are right hand while'the worm 13 is left hand, so that'the chuck shafts are operated counter-clockwise and the carrier shaft is rotated in the reverse direction. I

Chucks18 and 19 are keyed to the shafts- 117; and although any kind of chuck may be used, I prefer to employ a type having four magnetic-coils arranged at equal distances around the chuck as clearly seen in Figure 1.

As thechucks are-identical in construction and are only reversed in position as shown in Figure 2, a description of one will suflice in so far as the chuck construction is concerned. .r. plurality of copper sectors are carried by each of a pair of fiber rings 20, one terminal of each coil 19 being connected to a segment on one ring, while the other terminal is connected to a corresponding segment on the other ring.

In order to furnish electricity from any suitable source a pair of contact brushes 21 are secured to and insulated from a bushing surounding each shaft 17. These brushes .each consist of an arcuate shaped plate which extends substantially one fourth the way around a circle and aredisposed opposite each other. The chuck 18 has a portion thereof extending beneath the carrier disk 6 so that its upper face engages the under face of the disk beneath the rows of openings 7 The other magnetic: chuck 19 is disposed over the'carrier 6 so that a portion thereof overlaps the disk sufficiently to cover openinp s which pass beneath the chuck.

- Each chuck has a threaded portion 23 on its respective shaft 17 screwed therein. An enlargement 24 is provided upon each shaft 17 and in the case of the chuck 18 is of inverted frusto-conical shape to fit and rest in a similarly shaped end of the bushing 22. This bushing is mounted in a bearing 25 consisting of a pair of vertically spaced plates. The bushing is permitted to move vertically of the plates, constituting the bearings, but is prevented fromrotating therein by means of keys 26. The intermediate portion of the bushing is externally screwthreadcd as at 27 to co-operate with the threaded openings in a ring gear 28 rotatably mounted between the bearing plate and controlled by a pinion 29 rotatably mounted in one of the plates and; operated by a crank 30. As clearly seen in ,Figure 2, the pinion 29 meshes with the ring gear 28 to cause rotation thereof, and

the threads of the ring gear meshing with those of the bushing 22. causes vertical adjustment of the latter, and'consequent-ly of the magnetic chuck;

The frusto-conical enlargement 24 of a spindle 31 mounted upon the shaft extension 17 is seated within a similarly shaped recess in a bushing 32. This bushing is elongated and provided with a bore33, and

'anenlargedportion 34 thereof to receive the extension of the shaft 17 and the shaft.

spindle 31. This bushing also extends through a bearing slot36 forming a part of the machine and is prevented from rotation therein by a suitable key 37. The upper end with washers embedded in the spindle i T whereby the spindle 31 and consequently, the

in said adjusted position when desired. However, in order to permit lowering of the chuck, the bushing 32 is equipped with exterior screw-threads for co-operation with the threaded openings through a ring gear 40 mounted in a suitable recess or chamber in the bearing 36. A pinion 41 is suitably mounted in the bearing for meshing engagement with the ring gear, and a crank 42 is provided for imparting rotarymovement to the pinion, and consequently the ring gear.

A tool, or any other kind of mechanism for operating upon the work is positioned above and beneath the article carrier 6 in opposition to those portionsof the magnetic chuck which project within the confines of the carrier. Each tool, in the present instance is of the same construction, so that a description of one will suflice for both. Vertically disposed above the articlecarrier are a pair ofdiverging ways 43 having their outer ex.- tremities 44 extendingtoward each other as clearly seen in Figure 1. These ways form a part of an overhanging arm v45 of the ma; chine and mounted therebetween for vertical sliding adjustment are a pair of spaced blocks 46 vertically through which extend a shaft 47 having its lower end secured to a grinding element 48. The end; of the shaft 47 adjacent this element is provided with a frusto-conical enlargement 49 which fits within a similarly shaped recess in a packing49 secured within the-lowermost block 46. A pulley wheel .50 is secured intermediate the endsof the shaft 47 and is disposed between the two blocks 46- This pulley wheel. however may be replaced by.

an electric motor if desired. The upper end of this shaft extends through at] exteriorly cupshaped member 51 threaded into a recess in the upper block 46, and the extremity of gaged with the collar so as to provide for.

end thrust of the grinding element or tool in grinding so that it may support the bulk of the weight of the grinding tool when the same is; operation. A screw-cap '55 is threaded into the cupshape'd member 51 to close the open'end thereof. and to protect the parts within the member 51 against displacement. dust. dirt and the like.

In order that the grinding element 48n1ay he adiusted vertically at will. a screw. 56. extends vcrticallv through the blocks 16 andhas its lower end equipped with a pinion 57. This lowerend of the screw is arranged within a recess inthelower block 46 and is journaled in a suitable supporting bar. 58 forming a part: of the frame. A pinion 58 carried by a shaft extendszinto; therecess,

magneticchuck 19 may be raised and retained-meshes with the pinion 57 for rotating the screw 56, and a crank is provided upon the shaft for normal control thereof. Obviously, turning of the screw raises or lowers the blocks i6 and also the grindingelement 4:8 to adjust the latter relative to the worln The means for automatically delivering or feeding the article to the carrier consists of a platform or arm overhanging thearticle carrier in advance of the grinding tool arranged above'the magnetic chuck18. The platform is provided with a pair of spaced openings or apertures 62 which are adapted for alignment with any of the openings in the two rows of the article carrierf Each opening is surroundedbyia plurality of upstanding pins or posts 63 which hold the article or piston rings 6st in stacked formation upon the platform. As best seen in Figure 4, the platform is spaced slightly above the revolving carrier and the lowermost rings 6-1 in the two openings 62 drop into the first empty openings in the carrier which pass under the platform. Immediately, the next lowest rings in the stack are disposed in position to be delivered upon the revolving carrier.

I In order that the articles may be automatically discharged from the continuously rotating carrier 6 when the articles are finished, the surface plate 5 of the machine is provided with a cut-0ut portion 65. which extends under the carrier so that the rings as they pass the chuck 19 will drop by gravity through the cut-out portion. into the receptacle 66.

In operation, the grinding tools 48 are rotated, as well as the operating shaft li. The latter through the worms transmit rotary movement to the electromagnetic chucks 18 and 19, as well as to the continuously revolving carrier 6. It may be here stated that the worm 13 bears ratio to those 15 as the diameter of the article carrier 6 bears to the diameter of either chuck. As stated before, the article carrier will be rotated in a clock-wise manner as well as the pgrindinn tools 46. However. the two chucks ro tate in counter-clockwise manner.

The piston rings in the two openings in the delivery mechanism drop into the openings 7 in the continuously revolving carrierare supported in said openings by the surface plate 5. The rings are then advanced onto the electromagnetic chuck l8 and beneath the grinding tool 48 thereabove. The machine being properly timed, as the carrier advances the rings upon the magnetic chuck, the brushes 2i will be engaged with the rings 20, thereby closing; an electrical circuit and causing energization of the magnetic coil which is just be ginning to enter under the carrier 6. The articles in the openings of the carrier will of course be drawn down upon the upper surface of the magnetic chuck and will be held in proper position so that relative smooth may be ground upon the upper-f ces of the piston rir passing under the (grincin'gy tool .6. it to be understood that one of the brusl '71. of each in c'netic chuck is disposed under or above, asthe case may be. its ad cent grinding i.ool,.an:;l consequently after the rings have been acted upon by the grinding: element %8 above the carrieix the magnetic coil of the chuck 18 which has acted upon theserings around, becomes'deeneinired by the brushes disenga the rings of the chucks. lifter these 1' have lzecn operated upon by the upper grinding; tech continued rotation of the carrier causes them to pass beneath the portion of the other magnetic chuck 19 which overlaps the article carrier, at which time the brushes of the chuck, contact with the rings to cause certain of themagnetic coils to become energized whereby the two upper surfaces of the rings passing under the chuck will be drawn into engagement therewith while the relative lower grinding tool 48 is acting upon the relative lower surfaces of the rings. The magnetic coil. of the chuck 19 which has acted upon the rings becomes de-energized in a. manner identical with the chuck 18, so that the rings may be carried around by the carrier to the cut-away portion 65 of the surface plate 5, where the are permitted to disengage from their respective openings and drop by gravity into a suitable collecting receptacle 66. It is to be particularly noted that the article carrier 6 continually revolves to advance the articles from the delivery mechanism to a finishing element, and after they have been operated upon, are removed from said. finishing: clement and advanced by the can ricr to the other grinding tool and magnetic chuck.

The foregoing description and accompanying" drawings have reference to what might be considered to be the approved or preferred form of my invention. I desire it to be understood, howeverr that I may make such changes in the construction, combination and arrangement of parts materials, dimensions. ct cetera, as y prove expedient and fall within the scope of the appended claims.

Having thus described my in ention, what I claim as new and desire to secure by Lett ters Patent is 2- 1. machine for automatically finishing articles, comprising! in combination, a revolving carrier, magnetic means positioned adjacent opposite faces thereof, and a tool adjacent each magnetic means for finishing articles upon a plurality of faces.

2. A machine for automatically finishing articles, comprising in combination, a revolving carrier having a plurality of article receiving pockets, magnetic means positioned adjacent opposite faces thereof, and a tool opposing each magnetic means for finishing articles on a plurality of faces.

A machine for automatically finishing articles; comprising in combination, a re- 'volvin;1' carrier, rotatable magnetic chucks adjacent opposites faces of the carrier, and spaced apart a tool for each chuck disposed over faces of the carrier opposite the faces adjacent the chucks, and means for automatically energizing and de-energizing said chucks at intervals to hold and to release the articles.

4;. A machine for automatically finishing articles comprising, a rotatable carrier, a

pair of tools for finishing articles, one of said tools mounted below the rotatable car rier and in close proximity thereto,'and the second. tool mounted above the rotatable carrier and in close proximity thereto, a

pair of rotatable magnetic chucks, one each adjacent a tool and means for energizing and ale-energizing said chucks at intervals to hold and to release the articles.

In testimony whereof I aflix my signature in presence of two Witnesses.

' ELMER F. FROST. lVitnesses: WILLIAM WHITE, J. W. PETERUN. 

